Github user wuchong commented on the issue:
    Because SQL doesn't have standard user-defined table function, we introduce 
MS SQL Server's `CROSS/OUTER APPLY` to support UDTF , see .
    NOTE: In order to implement the `CROSS/OUTER APPLY`, we need to modify 
Calcite's SQL Parser. So we include `Parser.jj` from Calcite source code and 
add some modifications (search FLINK in this file). 
 for more UDTF design, 

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